Fluid-pressure system.



W. F. SCHNEIDER.

PLUIDPRESSURE SYSTEM. APPLICATION FILED APB.29,1907.

Patented Nov. 17. 1908.

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MwXom gamma Mm Iiii UNITED STATES WILLIAM F. SCHNEIDER, or A CORPORATION or NEW PANY, A CORPORATION OF 01110.

PATENT. OFFICE.

NORWOOD, OHIO, ASSIGNOR TO ALLIS-GHALMERS COMPANY, JERSEY, AND THE BULLOCK ELECTRIC MANUFACTURING COM- FLUID-PRESSURE SYSTEM.

systems, air for operating certain auxiliary a paratus such as whistles, sanders, etc., is 0 ten drawn from the same reservoir which supplies the brake system. If the brakes are ing of the whistle or the application of sand when the pressure in'the reservoir is down nearly to the minimum for which the operating mechanism of the supply pump is set, often drains the air from the reservoir until the pressure is brought much lower than the desired minimum before the pump has time to operate. Should it be attempted to apply the brakes at this time the pressure in the reservoir is often insuflicient to do so or so weak that the brake acts slowly and inef fectively. If a plurality of cars are used the conditions are still worse because of the greater amount of air required for the additional brakes. On the other hand, if the brakes are operated on the automatic system, the blowing of the whistle or the application of sand often reduces the pressure sufficiently to cause an undesired application of the brakes.-

It is the object of my present inventionto provide a system applicable to bot-h straight and automatic air brake systems and in which the use of air'for auxiliary apparatus is not attended by these objections; in other words, to make the action ofthe air brakes entirely independent of the operation of any I auxiliary fluid pressure operated apparatus.

With these objects in View, my invention comprises the combination of two reservoirs,

connected to independent sets of fluid pressure operated apparatus, means for connecting said two reservoirs when the pressure in one of them exceeds a predetermined value, and a pump for supplying fluid pressure to that-reservoir; This pump is preferably con- Specification of Letters Patent.

Application filed April 29, 1907.. Serial No. 370,949.

operated on the straight air system, the blow-.

Patented Nov. 17, 1908.

trolled in response to variations of pressure 111 both reservoirs.

Other features of my invention will ap-,

pear from the description and drawings and will be particularly pointed out in the claims. The single figure of the drawings shows diagrammatically one embodiment of my invention.

An electric motor 10, here shown as-serieswound, is arranged to drive an air compressor or other fluid pump 11. The compressor 11 supplies air directly to a reservoir 12 from which air may be drawn through an engineers valve 13 to supply an air-brake system 13 of any desired type, straight/ 01 automatic, though here shown as a straight air system. A second reservoir 14 is supplied from the reservoir 12 through an ad- JLIStRblG pop valve 15 arranged to open to connect the two reservoirs when the pressure in the reservoir 12 exceeds a predetermined value, say 75 lbs. Air may be drawn from the reservoir 14 to supply the whistle 16, the sander, and other auxiliary apparatus.

Two Bourdon gages 17 and 18 are connected to the reservoirs l2 and 14 respectively, the fingers of these gages engaging the stationary contacts 19 and 20 respectively when the pressures in their associated reservoirs fall to their respective minim-a, say 60 and A0 lbs., and the finger of the gage 17 engaging the stationary contact 21 when the pressure in the reservoir 12 reaches a predetermined maximum, say 80 lbs, slightly :greater than the value at which the valve 15 opens. The circuit of the motor 10 controlled by a magnetically operated switch '22, which may be connected to operate in any desired manner. As here shown the switch-closing magnet 23 is energized when the pressure in either reservoir 12 or 14: reaches its minimum and the switch-opening magnet 24 when the pressure in the reservoir 12 reaches its maximum; 23 and :24 are deenergized as soon as they have operated the switch 22, the former by being slmrt-circuited by the closing of the switch and. the latter by having its circuit in terrupted by the opening of the switch. Thus there is no sparking the contacts of the Bourdon gages. However, this ieature forms no part of my present invention and any other form of magnetically, operated switch may be used to control the motor 10,

The magnets the particular arrangement shown beingm'erely a desirable one.

Suppose the pressures in the two reser- .voirs'1'2 and 14: to be above their respective air may be drawn from the reservoir, 12 for iliary apparatus minima but below the pressure at which the valve 15 is open. Air may now be drawn from the auxiliary reservoir 14 .for the operation of the whistle, sander, or other auxwithout affecting the pressure in the reservoir 12. Correspondingly,

.the operation of the air brake system without affecting the pressure in the reservoir 14:. \Vhen the pressure in either reservoir reaches its minimum, the; fiflger of e Bour;

don gage associated with that reser ir engages the contact 19 or 20, as the case may be,

the switch 22 to closed position, in which position 'it short-circuits the solenoid 23 and the finger of the Bourdon gage which completed the circuit of said solenoid. The motor 10 now operates to supply air to the reservoir 12. When the'air in said reservoir reaches-the pressure for which the valve 15 is set, said valve opens to connect the two reservoirs to permit air to pass from the reservoir 12 to the reservoir 14. When the pressure in the two reservoirs now reaches the maximum the finger of the Bourdon age 17 engages the contact 21 to complete the circuit-oi the solenoid 24, which being thus energized opens the switch 22 to break the circuit of the motor 10 and also its own circuit. As soon as a small amount of air is now drawn from either reservoir the pressure in the two reservoirs falls; below the value for which the valve 15 is set and said valve closes to render the pressures in said two reservoirs independent of each other'.'

As the pressure in either reservoir falls to its minimum, the above described cycle of operations is repeated, maintaining the pressure in the reservoir 12 always between its maximum and minimum, here taken as $0 and 60 lbs. respectively, and the pressure m- 1 the reservoir 14 between the same maximum and its own minimum, here taken. as 40 lbs.

Many modifications in the precise 'arrangements here shownand described may be made 'withoutdeparting from the-spirit and scope of my invention and all such I aim to cover in the following claims.-

What I claim as new isz-e 1. In combination, two reservoirs for supplying fluid pressure to main and auxiliary fluid pressure operated apparatus respectively, a pop valve between said two reservoirs arranged to open"when the pressure in one of said reservoirs exceeds a predetermined value, and a pump for supplying fluid ressure to the reservoir which supplies tne main fluid pressure apparatus.

2. In combinatiom two reservoirs, each thus completing the circuit of the solen-. oid 23. This solenoid being energized moves mined value.

' matically said pump.

sup lying an independent set of fluid operate apparatus, means for connecting said two reservoirs when the pressure in one of them exceeds a predetermined valum and a pump for supplying fluid pressure to that reservoir.

3. In combination, two reservoirs, each supplying an independent set of fluid operated apparatus, and means for connecting said two reservoirs when the pressure in one of them exceeds a predetermined value.

4C. In combination, two reservoirs, each supplying an independent set of fluidoper- -ated. apparatus, means for connect ng said 'two reservoirs whenthe pressure in one of them exceeds a predetermined value,'a pump for supplying fluid pressure to that reservoir, and means'for controlling said pump in response to variations of pressure in eac them exceeds a predeterm ned value, and

automatic means for maintaining the pressure in each reservoir within predetermined .l1m1ts.

7. In-a fluid pressure system, the combi-I nation of two reservoirs, an a r-brake system connected to one of said reservoirs, auxiliary pressure operated apparatus connected tothe other of said reservoirs, meansfor connecti ig said vtwo reservoirs when the pressure in one of them exceeds a predetermined value, and a pum for supplying fluid pressure to one of sai reservoirs.

8. In afluid pressure system, the combination of two reservoirs, an air-brake system connected to. one of said reservoirs, auxiliary pressure operated apparatus connected to the other of said reservoirs, and means for connecting .said two reservoirs [when the pressure in one of them exceeds a predeter- 9.-In a fluid pressure system, the combination of two reservoirs,- anair-brake system connected to one of said reservoirs, auxiliary pressure operated apparatus connected to the other of said reservoirs, means for connecting said two reservoirs when the pressure in one ofthem exceeds a-predete'r mined value, a puinp'for supplying fluid pressure to one of said reservoirs, and autocontrolled means for operating 10. In a fluid pressure system, the combination of two reservoirs, an air-brakeoperating said pump, and means for con- I trolling saidoperating means in response to the variations in .the pressures in said two reservoirs.

11, In a fluid pressure system,. the com-v bination of two reservoirs, an air-brake system connected to one of said reservoirs, auxiliary pressure operated apparatus connected to the other of said reservoirs, means for connecting said two reservoirs when the pressurein one of them exceeds a .predeter mined value, a pump. for supplying fluid pressure to one ofsaid' reservoirs, and automatic means for maintaining the pressure in each reservoir within predetermined limits.

w 12. In a fluid pressure system, the combination of two reservoirs, an air -brake system connected to one of said reservoirs, .auxiliary pressure operated-apparatusconnected to the other of said reservoirs, means for connecting said two reservoirs when the pressure in one of them exceeds a predetermined value, a pump for supplying fluid pressure to one of said reservoirs, and meansfor starting said pump when the pressure in either reservoir reaches its respective pre determined minimum and for stopping said pump when the-pressure in the reservoir :supplied directly by the pump reaches a predetermined maximum.

13. In a fluid pressure system, the combination of a pump, a reservoir'supplied thereby, a set of fluid pressure operated apparatus supplied fromsaid reservoir, ase'cond reservoirsupplied from the first through a valve which is open only when the pressure in the. first exceeds a predetermined value, a set of fluid pressure operated apparatus sup lied 1 from said second reservoir, a' motor for riving said pump, and means for starting said motor when the pressure in either reservoir reaches its predetermined minimum and for stopping said pump when the pressure in the first reservoir reaches a predetermined maximum.

14. In a fluid pressure system, a reservoir, an air-brake system connected thereto, a s'eo-- ond reservoir, auxiliary air pressure operated apparatus connected thereto, and a valve r connecting said reservoirs when the pressure in the first reaches a predetermined value.

15. In a fluid pressure system, a reservoir, an air-brake system connected thereto, a second reservoir, auxiliary air pressure oper ated apparatus connected thereto, a valve for connecting said reservoirs when the pressure in the'first reservoir exceeds a predetermined value, and a motor driven pump supplying said first reservoir and controlled automatically by the pressures in the two reservoirs.

' 16. In a fluid pressure system, a reservoir, an air-brake system connected thereto, a second reservoir,- auxiliary airv pressure operated apparatus connected thereto, a valve for connecting said reservoirs when the pressure in one of'said reservoirs exceeds a predetermined value, and a motor driven pump controlled automatically by the pressures in the two reservoirs to supply the reservoir the pressure in which controls said valve.

17. In a fluid pressure system, the combination of a main reservoir, an air-brake sysra'tus supplied from said reservoir through a pop valve and a second reservoir, said pop valve being arranged tobe closed except when the pressure in the main reservoir ex ceeds a predetermined value. a

19. In combination, two reservoirs, an airbrake system supplied from one of said reservoirs,"auxiliary air pressure operated apparatus' supplied from the'other reservoir,

means for connecting said two reservoirs when the pressure the first exceeds a predetermined value, maintaining the pressure within said first reservoir-within predetermined limits be: tweeniwhich is the pressure at which said connecting means operates.

20. In combination, two reservoirs, an airbrake system supplied from one'of saidreservoirs, auxiliary air pressure operated apparatus supplied from the otherreservoir, means for connecting said two reservoirs when the pressure in the first exceeds a predetermined value, and automatic means for maintaining the, pressureswithin both reservoirs within predeterminedlimits.

21. In a fluid pressure system,the combination of two reservoirs, an air-brake system and auxiliary apparatus supplieddrom said; two'reservoirs respectively, means for conand means for operating said motor to mainand automatic means for,

tain the pressure Within said lor'akesupply ing reservoir Within predetermined limits and for startings'aid motor when the pres sure in the other reservoir reaches a predetermined minimum.

22. In a fluid pressure system, the combination of two reservoirs, two sets of fluid pressure operated apparatus connected to said two reservoirs respectively, and a single means for supplying fluid pressureto said two reservoirs and arranged to be controlled in response to variations in pressure of each.-

23. In a fluid pressure system, thecombi nation of two fluid pressure reservoirs, two

sets of apparatus operated by fluid pressure and con/n'eetdto'said two reservoirs respectively, asingle means for supplying fluid pressure to said reservoirs, and means for eontrollingsaid supply means to maintain the pressure Within each reservoir Within predetermined limits.

In testimony whereof I aifix my signature in the presence of two witnesses. 

